POLLUTANT REDUCTION PLAN (PRP)POLLUTANT REDUCTION PLAN (PRP) EAST ALLEN TOWNSHIP NORTHAMPTON COUNTY...

POLLUTANT REDUCTION PLAN (PRP)

EAST ALLEN TOWNSHIP NORTHAMPTON COUNTY

PENNSYLVANIA

January 18, 2019

PREPARED FOR:

EAST ALLEN TOWNSHIP 5344 Nor-Bath Boulevard Northampton, PA 18067

PREPARED BY:

252 Brodhead Road, Suite 100

Bethlehem, PA 18017-8944 610.691.5644 • Fax 610.691.6968

Hanover Project EA19-21

Table of Contents I. Introduction ...........................................................................................................................1 II. Public Participation ...............................................................................................................1

A. Public Notice Language ....................................................................................................................... 2 B. List of Public Comments ..................................................................................................................... 2 C. List of Comments and Record of Consideration ............................................................................. 2

III. Mapping ................................................................................................................................ 2 A. East Allen Township’s Urbanized Area and MS4 Responsibilities ............................................... 2 B. Land Uses within the MS4 Planning Area ......................................................................................... 5 C. MS4 Zones ............................................................................................................................................. 5 D. Surface Waters ....................................................................................................................................... 6

IV. Pollutant Loadings ................................................................................................................ 7 A. Methods .................................................................................................................................................. 7 B. Existing Stormwater BMPs in the Planning Area ............................................................................ 8 C. Pollutant Load Calculation .................................................................................................................. 9 D. Pollutant Load Reduction Requirements .........................................................................................11

V. BMPs Selected to Achieve the Minimum Required Reductions in Pollutant Loading ...... 13 A. Summary of Alternatives and Selection of BMPs ..........................................................................13 B. Pollutant Removals .............................................................................................................................13 C. Operation and Maintenance Requirements .....................................................................................15

VI. Summary .............................................................................................................................. 18 Appendices A Public Notice B MapShed 2011 Land Use and MS4 Planning Area C Calculations for Proposed BMP Sediment Load Reductions D Proposed BMP Locations and Watersheds E Project Designs (to be updated as prepared)

East Allen Township 1 Pollutant Reduction Plan

I. Introduction East Allen Township is rural agricultural community located along the southern foot slopes of the Blue Mountain in the central portion of Northampton County, Pennsylvania. The Township is approximately four (4) miles north of the urbanized core of the Lehigh Valley, which includes the Cities of Allentown and Bethlehem and the Boroughs of Catasauqua and Northampton, with more rural and agricultural communities lying to the immediate north. The Township surrounds the Borough of Bath on three (3) sides within its northeastern corner. The Township is approximately 14.67 square miles in size, with a total population of approximately 4,903 according to the 2010 U.S. Census. Approximately 3,142.1 acres (4.91 square miles) is classified as Urbanized Area (UA), in accordance with the 2010 U.S. Census data. The portion of the UA that contributes runoff to known stormwater outfalls into streams is approximately 1,378.7 acres (2.15 square miles); this area is known as the Planning Area for the development of this Pollutant Reduction Plan (PRP). Within the Township, there are approximately 37.82 miles of State Highways and approximately 16.42 miles of Local Township Roads. This Pollutant Reduction Plan (PRP) was developed for the Township as a requirement of Permit PAI#132212 for their Municipal Separate Storm Sewer System (MS4). The PRP outlines the actions the Township will take to address pollutant loads to the streams within the Township and downstream waterways. These actions include public participation, mapping of outfalls and other discharges, calculation of pollutant loads, implementation of stormwater Best Management Practices (BMPs), and undertaking operations and maintenance (O&M) activities.

II. Public Participation

Public participation is an essential part of the PRP because it enhances buy-in from residents, business owners, and landowners that may have an impact on pollutant discharges, can uncover missing elements or errors in calculations, and builds cooperative partnerships among the Township and other entities. The Township advertised the development of the PRP via Public Notice on January 10 and January 17, 2019 in the Northampton Press. The notice ran for two (2) days and stated the PRP was available for review and comment from January 18, 2019 through February 17, 2019, from 8:30 a.m. to 3:30 p.m at the Township Building. Proof of publication with a copy of the public notice is provided in Appendix A. The public was given 30 days to provide comments on the contents of the PRP. A digital copy was also made available on the Township website for the duration of the 30-day comment period. A presentation about the MS4 program and the PRP was provided by the Township Engineer during the regularly scheduled Supervisors’ meeting held on February 13, 2019, providing an additional opportunity for comment by the Supervisors and the public.


A. Public Notice Language

PUBLIC NOTICE NOTICE IS HEREBY GIVEN that the East Allen Township Board of Supervisors will receive public comments on the proposed Pollutant Reduction Plan (PRP) required for the 2019-2024 NPDES Municipal Separate Storm Sewer Systems (MS4) Permit. The proposed PRP is available for review at the Township Office located at 5344 Nor-Bath Boulevard, Northampton, PA 18067, from 8:30 a.m. to 3:30 p.m., Monday through Friday, January 18 through February 17, 2019. Digital copies are also available at www.eatwp.org. Requests for copies may be made by contacting the Township at 610-262-7961 or [email protected]. The Township will accept written comments for 30 calendar days from the date of this notice, postmarked no later than February 17, 2019, and addressed to Brent Green, Township Manager, at the above-listed address. Email comments may also be submitted to [email protected]. The email subject line shall include “Comments – East Allen Township PRP.” The Township Board of Supervisors will provide an opportunity for interested parties to provide comments during their regularly scheduled meetings on January 24 and February 13, 2019, at 7:00 p.m. at the above-listed address. Brent Green, Township Manager

B. List of Public Comments

No public comments were received by the Township. (to be revised, accordingly, immediately following the public comment period)

C. List of Comments and Record of Consideration

No public comments were received by the Township, and therefore no amendments based on public comments were necessary. (to be revised, accordingly, immediately following the public comment period)

III. Mapping

A. East Allen Township’s Urbanized Area and MS4 Responsibilities

The Township is located within three (3) HUC12 watersheds, including the Catasauqua Creek HUC12 Watershed, the Monocacy Creek HUC12 Watershed, and the East Branch Monocacy Creek HUC12 Watershed (see Figures 1 and 2). The Township’s Urbanized Area (UA) is found in all three (3) HUC12 watersheds and contains thirty-six (36) regulated MS4 discharges, with a total drainage area of 1,378.7 acres (2.15 square miles), as shown in Figure 1. Remaining lands within


the UA are either in private ownership (non-municipal) or have been determined to not produce concentrated discharges of stormwater runoff to or from municipal land or infrastructure into “waters of the Commonwealth/United States.” The Planning Area within the UA includes the drainage areas to all thirty-six (36) regulated MS4 discharges, with the streams in all three (3) HUC12 watersheds impaired by siltation, either within the Township or within five (5) miles downstream of regulated MS4 discharge points.


Figure 1: Map of Urbanized Area (UA) for East Allen Township


B. Land Uses within the MS4 Planning Area

Land uses within the MS4 Planning Area are comprised of primarily cropland and high-density mixed urban, with lesser areas of hay/pasture, open land, forest, low-density mixed urban, medium-density mixed urban, low-density residential and medium-density residential. The land uses determined through the use of MapShed modeling software are summarized below in Table 1 and are shown in Appendix B. Table 1. Land Use Areas within the MS4 Planning Area for East Allen Township

Land Use Type Catasauqua

Creek HUC12 Area (acres)

Monocacy Creek HUC12 Area (acres)

East Branch Monocacy

Creek HUC12 Area (acres)

Total MS4 Planning Area

(acres)

Hay/Pasture 25.70 10.96 --- 36.66

Cropland 551.89 30.04 --- 581.93

Forest 14.08 11.82 --- 25.90

Wetland --- --- --- 0.00

Disturbed Area --- --- --- 0.00

Turfgrass --- --- --- 0.00

Open Land 26.16 7.32 --- 33.48

Bare Rock --- --- --- 0.00

Sandy Areas --- --- --- 0.00

Unpaved Road --- --- --- 0.00

Low-Density Mixed Urban 19.88 7.16 --- 27.04

Medium-Density Mixed Urban 68.80 9.54 --- 78.34

High-Density Mixed Urban 26.85 103.36 --- 130.21

Low-Density Residential 169.28 14.29 4.61 188.18

Medium-Density Residential 255.96 6.92 --- 262.88

High Density Residential --- --- --- 0.00

TOTAL MS4 PLANNING AREA 1,158.60 201.41 4.61 1,364.62

C. MS4 Zones

For the purpose of developing this Pollutant Reduction Plan (PRP), the Township has three (3) MS4 Zones corresponding to the three (3) HUC12 watersheds which all drain into the lower reaches of the Lehigh River. The streams in all three (3) HUC12 watersheds are impaired by siltation from urban and/or agricultural runoff, either within the Township or within five (5) miles downstream. Under the Township’s MS4 permit, impairment by siltation must be addressed with a 10 percent reduction in sediments from drainage areas associated with Township owned/managed properties or infrastructure within Urbanized Areas (UAs). The majority of the Urbanized Area (UA) in East Allen Township is within the Catasauqua Creek HUC12 Watershed, containing twenty-three (23) of the thirty-six (36) regulated MS4 outfalls.


Twelve (12) regulated MS4 outfalls are within the Monocacy Creek HUC12 Watershed and only one (1) regulated MS4 outfall is within the East Branch Monocacy Creek HUC12 Watershed. The majority of UA within the Catasauqua Creek HUC12 Watershed is comprised of cropland, low-density residential, and medium-density residential land use, with lesser areas of mixed urban, open land, hay/pasture, and forest land uses. Urbanized Areas within the Monocacy Creek HUC12 Watershed are comprised primarily of open land (large limestone quarry), cropland, and forest, with lesser areas of residential, commercial, and industrial land uses. Urbanized Areas within the East Branch Monocacy Creek HUC12 Watershed are comprised of primarily industrial land use, with lesser areas of residential and forest land uses. Based on field evaluations conducted during 2003-2018, there are many land areas within the Township’s UA that do not contribute concentrated flows to Township-owned or operated facilities, or which do not contribute concentrated flows from Township-owned or operated facilities into nearby streams, and therefore do not have MS4 regulated outfalls and are not part of the Planning Area for the development of this PRP. There are also considerable farmlands and one (1) very large limestone quarry within the UA which do not have any MS4 regulated outfalls. Soils throughout the Township are derived primarily from limestone and shale geology and are moderately well- to well-drained in most areas. Slopes throughout the Township are level to moderate, with countless closed depressions and sinkholes, which reduces runoff and increases infiltration in undeveloped and farmed areas. The mapping provided in Appendix B shows the MS4 regulated outfalls and respective drainage areas within East Allen Township.

D. Surface Waters

Ultimately, all stormwater discharges from the Urbanized Area (UA) in the Township are to the Catasauqua Creek, Monocacy Creek, and East Branch Monocacy, which all discharge into the lower reaches of the Lehigh River, which discharges soon thereafter into the Delaware River. The Monocacy Creek and East Branch Monocacy Creek are classified as High Quality – Cold Water Fishes (HQ-CWF) and Migratory Fishes (MF), and are listed as being impaired for recreational use due to pathogens and for aquatic life use due to siltation and habitat alterations. The Catasauqua Creek is classified as Cold Water Fishes (CWF) and Migratory Fishes (MF), and is listed as being impaired for recreational use by pathogens and for aquatic life use due to siltation. The Lehigh River is classified as Warm Water Fishes (WWF) and Migratory Fishes (MF), and is listed as being impaired for aquatic life use due to siltation, suspended solids, and organic enrichment/low dissolved oxygen. The Delaware River is classified as Warm Water Fishes (WWF) and Migratory Fishes (MF), and is listed as being impaired for fish consumption due to mercury. MS4 outfall discharges within the Township are either directly into the main stems of the Catasauqua and Monocacy Creeks or are found in the drainage areas of smaller unnamed contributory streams draining to them. The only MS4 outfall discharge to the East Branch Monocacy Creek is into a swale along an active rail line. Within the Township, only the Monocacy Creek is listed as impaired by siltation. The Catasauqua and East Branch Monocacy Creeks are listed as impaired by siltation within downstream segments less than five (5) miles from respective regulated MS4 discharges within the Township. The Lehigh River is listed as impaired for aquatic life use due to siltation, suspended solids, and organic enrichment/low dissolved oxygen. The Pennsylvania Department of Environmental Protection (DEP) has included these waterways on their MS4 Requirements Table, last revised March 5, 2018, as indicated below in Table 2:


Table 2. MS4 Requirements Table for East Allen Township

MS4 Name

NPDES ID

Individual Permit

Required Reason

Impaired Downstream

Waters Names Requirement(s)

Other Cause(s) of Impairment

East Allen Township

PAI132212 Yes

Special Protection, Individual

Permit

Catasauqua Creek Appendix E-Siltation None East Branch

Monocacy Creek Appendix E-Siltation Other Habitat

Alterations (4c) Monocacy Creek Appendix E-Siltation None

Lehigh Creek Appendix E-Organic

Enrichment/Low D.O., Siltation, Suspended Solids (5)

Water/Flow Variability (4c)

NOTE: In watersheds where siltation is listed as a concern, the MS4 permittee must reduce sediment loading by 10 percent.

IV. Pollutant Loadings

A. Methods

Sediment loading coefficients derived from MapShed Version 1.5.1 were used to calculate the existing sediment load within the designated MS4 Planning Area of East Allen Township. Loading coefficients for land uses within each of the three (2) HUC12 watersheds within East Allen Township (see Figure 2) were applied to land use areas within the respective Planning Areas to develop existing sediment loads within each HUC12 watershed. The results were aggregated to develop the total existing sediment load for the total Planning Area within East Allen Township, with all HUC12 watersheds draining into the lower reaches of the Lehigh River.


Figure 2: Map of MapShed Basin for East Allen Township

B. Existing Stormwater BMPs in the Planning Area

East Allen Township was historically an agricultural community with a major limestone quarry/cement plant, located just to the north of the Cities of Allentown and Bethlehem in the Lehigh Valley. In recent decades, many farms were converted to residential, commercial, and industrial development and other land uses such as recreational and institutional. U.S. Route 22 was constructed nearby to the Township’s southern boundary during the 1950s to improve transportation within the Lehigh Valley, connecting the nearby urban areas with major highways leading to New York City, Philadelphia, and other outlying areas. The improved transportation increased land development within the nearby East Allen Township to meet increased demands for housing, industry, commercial development, and warehousing. Earlier land development activities required varying degrees of stormwater management and water quality protection, with either no stormwater management controls or older facilities aimed largely at conveyance and flood protection. The combination older urban and agricultural land uses contributed to a listing of non-attaining for sediment pollution in all streams within the Township. Newer land development within the Township has required stormwater management facilities aimed at improving and protecting water quality. Since 2007, National Pollutant Discharge Elimination System (NPDES) permits requiring both construction site and post construction stormwater management to reduce or eliminate pollutants from stormwater have been required


for new land development projects within East Allen Township. For such sites within the Planning Area for this PRP, the drainage areas and sediment discharges may be “parsed-out” of the total existing sediment load, from which the reduction of 10 percent is required. Two (2) sites with qualifying MS4 regulated outfalls, having water quality controls, were identified within the East Allen Township Planning Area, as summarized below:

Outfall 36-A – In July 2014, a new commercial/institutional land development plan that required an NPDES permit from PA DEP was constructed. The NPDES regulations required stormwater management to infiltrate and improve stormwater quality for the discharge from this site. The drainage area to this site is approximately 3.59 acres, with treatment provided by an infiltration basin to the rear of the proposed building and parking areas. In consideration of a 0.95 sediment removal coefficient, this system results in a sediment load reduction of 562.4 lbs/year, which may be subtracted from the raw Total Existing Sediment Load calculated for the Township’s 201.41-acre Planning Area within the Monocacy Creek HUC12 Watershed. See Table 3, below, and reference Appendix C – Calculations for Existing BMP Load Reductions.

Outfall 36-B – In February 2007, a new commercial/industrial land development plan that required an NPDES permit from PA DEP was constructed. The NPDES regulations required stormwater management to control rate and improve stormwater quality for the discharge from this site. The drainage area to this site is approximately 110.17 acres, with treatment provided by a large wet pond. In consideration of a 0.60 sediment removal coefficient, this system results in a sediment load reduction of 9,790.1 lbs/year, which may be subtracted from the raw Total Existing Sediment Load calculated for the Township’s 201.41-acre Planning Area within the Monocacy Creek HUC12 Watershed. See Table 3, below, and reference Appendix C – Calculations for Existing BMP Load Reductions.

Table 3. Existing Stormwater BMPs in the Planning Area

Facility/NPDES Permit Number

BMP Type Date of Installation

Coordinates Treatment Area (ac)

Efficiency Sediment Load Reduction

(lbs/yr) Outfall 36-A St. Luke’s Hospital PAI024814008

Infiltration Basin

July 2014

40.711674ON -75.393739OW

3.59 0.95 562.4

Outfall 36-B Arcadia East PAI024805021(1)

Wet Pond February 2007

40.712773ON -75.392026OW

110.17 0.60 9,790.1

C. Pollutant Load Calculation

To model the existing sediment load for the MS4 Planning Areas in East Allen Township using the MapShed program, base model runs were completed for the Catasauqua Creek, Monocacy Creek, and East Branch Monocacy Creek HUC12 watersheds. The Urbanized Area of the Township is primarily within the Monocacy Creek HUC12 watershed, with the remainder being relatively small areas within the Catasauqua Creek and East Branch Monocacy Creek HUC12 watersheds. Sediment impairment is only listed for all three (3) HUC12 watersheds. Catasauqua


Creek drains directly into the Lehigh River in the Borough of Northampton. The East Branch Monocacy Creek HUC12 watershed is a sub-basin to the Monocacy Creek HUC12 watershed, which discharges directly to the Lehigh River in the City of Bethlehem. Therefore, while the base model runs were conducted separately for these three (3) distinct HUC12 watersheds, the loadings were aggregated as the basis for the overall 10% reduction in sediment. MapShed was used to determine land uses and sediment runoff coefficients, or loading rates, for the Urbanized Areas and Planning Areas within East Allen Township. ArcMap was then used to develop drainage areas to all previously identified MS4 outfalls, for which the same land use data were applied to determine the sediment load for the Planning Area within the Urbanized Areas. The Existing Pollutant Loading for sediment was then calculated for the Planning Area using the previously derived land use loading coefficients. See Table 4, below, for land use loading rates and respective pollutant load calculations. The pollutant load reductions from the two (2) recent land development projects with existing stormwater BMPs (i.e., Arcadia East and St. Luke’s facilities along Route 512) were subtracted from the total existing load for the Planning Area.

Table 4. MapShed Sediment Land Use Loading Rates and Calculated Pollutant Loads for Planning Areas within the Catasauqua Creek, Monocacy Creek, and East Branch Monocacy Creek HUC12 Watershed Areas

Land Cover Sediment Loading

Rate (lbs/ac/yr) Area (ac)

Sediment Load (lbs/yr)

Catasauqua Creek HUC12 Hay/Pasture 207.2 25.70 5,325.3Cropland 2668.5 551.89 1,472,702.9Forest 15.7 14.08 220.6Wetland 11.2 --- 0.0Disturbed Area 0.0 --- 0.0Turfgrass 52.9 --- 0.0Open Land 206.1 26.16 5,392.7Bare Rock 0.0 --- 0.0Sandy Areas 0.0 --- 0.0Unpaved Road 0.0 --- 0.0Low-Density Mixed Urban 38.9 19.88 773.6Medium-Density Mixed Urban 175.1 68.80 12,046.8High-Density Mixed Urban 175.1 26.85 4,701.9Low-Density Residential 38.9 169.28 6,588.1Medium-Density Residential 175.1 255.96 44,821.5High Density Residential 175.0 --- 0.0 Subtotal 1,158.60 1,552,573.3

Monocacy Creek HUC12 Hay/Pasture 146.3 10.96 1,604.3Cropland 1343.6 30.04 40,361.6Forest 12.7 11.82 149.8Wetland 5.8 --- 0.0Disturbed Area 76.8 --- 0.0Turfgrass 82.1 --- 0.0


Open Land 147.8 7.32 1,081.7Bare Rock 0.0 --- 0.0Sandy Areas 0.0 --- 0.0Unpaved Road 2551.0 --- 0.0Low-Density Mixed Urban 39.4 7.16 282.2Medium-Density Mixed Urban 171.7 9.54 1,638.2High-Density Mixed Urban 171.7 103.36 17,743.5Low-Density Residential 39.4 14.29 562.9Medium-Density Residential 171.7 6.92 1,187.2High Density Residential 171.5 --- 0.0 Subtotal 201.41 64,611.4

East Branch Monocacy Creek HUC12 Hay/Pasture 196.2 --- 0.0Cropland 1915.0 --- 0.0Forest 17.2 --- 0.0Wetland 7.2 --- 0.0Disturbed Area 120.0 --- 0.0Turfgrass 0.0 --- 0.0Open Land 216.0 --- 0.0Bare Rock 0.0 --- 0.0Sandy Areas 0.0 --- 0.0Unpaved Road 2824.5 --- 0.0Low-Density Mixed Urban 39.7 --- 0.0Medium-Density Mixed Urban 169.9 --- 0.0High-Density Mixed Urban 170.0 --- 0.0Low-Density Residential 39.7 4.61 183.0Medium-Density Residential 170.0 --- 0.0High Density Residential 0.0 --- 0.0 Subtotal 4.61 183.0

TOTAL 1,364.62 1,617,367.8

Based on these existing load calculations, it was determined that the Township’s total existing sediment loading is 1,617,367.8 lbs/year. The existing sediment loading for the Planning Area within the Catasauqua Creek HUC12 Watershed is 1,552,573.4 lbs/year. The existing sediment loading for the Planning Area within the Monocacy Creek HUC12 Watershed is 64,611.4 lbs/year. The existing sediment loading for the Planning Area within the East Branch Monocacy Creek HUC12 Watershed is 183.0 lbs/year.

D. Pollutant Load Reduction Requirements

For East Allen Township, sediment is the only pollutant that requires reduction under the current MS4 Program requirements. The sediment pollution reduction requirement is 10 percent by weight from the Planning Area for each of the three (3) HUC12 watersheds. Therefore, based on the above-calculated sediment pollutant loads by HUC12 watersheds, prior to parsing-out


sediment load reductions for existing qualifying stormwater BMPs, raw sediment reductions required are:

155,257.3 lbs/year for the Catasauqua Creek HUC12 Watershed 6,461.1 lbs/year for the Monocacy Creek HUC12 Watershed 18.3 lbs/year for the East Branch Monocacy Creek HUC12 Watershed

The total sediment load reduction required (minimum) for the Township, therefore, is 161,7736.8 lbs/year. The 10 percent minimum reductions will be accomplished for each HUC12 watershed area using retrofits to existing conventional stormwater management facilities and new stormwater management BMPs. Where applicable (i.e., Monocacy Creek HUC12 Watershed – Outfalls 36-A and 36-B), the existing sediment load is reduced to account for sediment removals by qualifying existing BMPs. Final sediment load reductions required for each HUC12 watershed are summarized below in Table 5.

Table 5. Pollutant Load Reduction Requirements for the MS4 Planning Area within East Allen Township

Planning Area Name Area (acres)

Land Use Sediment Load (lbs)

Catasauqua Creek HUC12 Watershed

Existing Load – Land Use 1,158.6 1,552,573.4

Existing BMP Load Reduction N/A N/A

Finalized Existing Load 1,552,573.4

Required 10% Reduction 155,257.3

Monocacy Creek HUC12 Watershed

Existing Load – Land Use 201.4 64,611.4

Existing BMP Load Reduction 113.8 10,352.5

Final Existing Load 54,258.9

Required 10% Reduction 5,425.9

East Branch Monocacy Creek HUC12 Watershed

Existing Load – Land Use 4.6 183.0

Existing BMP Load Reduction N/A N/A

Final Existing Load 183.0

Required 10% Reduction 18.3

TOTAL EXISTING LOAD – LAND USE 1,364.6 1,617,367.8

TOTAL EXISTING BMP LOAD REDUCTION 10,352.5

TOTAL FINAL EXISTING LOAD 1,607,015.3

TOTAL REQUIRED 10% REDUCTION 160,701.5


V. BMPs Selected to Achieve the Minimum Required Reductions in Pollutant Loading

Based on the 10 percent sediment load reduction targets established above, East Allen Township has identified potential BMPs to meet the minimum load reductions during the next 5-year permit term. BMPs for stormwater management were determined, based on available public land, existing facilities, and potential for pollutant removal. All potential stormwater BMPs listed in the BMP Effectiveness Values table provided by PA DEP were considered. A list of the BMPs selected for East Allen Township to meet sediment loading reduction goals is provided below in Table 6, with a location map provided in Appendix D.

A. Summary of Alternatives and Selection of BMPs

The Township identified and evaluated BMPs, according to the following criteria:

Sediment reduction Cost-effectiveness of pollutant reduction Ownership (public vs. private land, single party vs. multi-party ownership) Funding and workforce availability Community benefit (site accessibility, flooding relief, aesthetics, etc.) Connectivity to other completed or proposed stormwater BMPs Timeframe to implement

The purpose of the evaluation was to determine the most cost-effective BMPs that would benefit water quality and the community. The highest priority BMPs are included in this PRP. The BMPs selected are a list of good opportunities that the Township has identified and may use to meet their required sediment reduction. The Township is not committing to implementing all the BMPs listed in this PRP, as that would exceed their required reduction. The actual implemented BMPs will be based on further site evaluation, negotiations with stakeholders, detailed design criteria, permitting complexity, and cost. The plan will be adjusted and revised, as new opportunities arise and as necessary to accomplish reduction goals with the most cost-effective BMPs. The Township will continuously evaluate cost-effective opportunities to meet required reductions. These could include working jointly with other municipalities on a joint project if viable opportunities arise. The Township will also evaluate opportunities to work with future private developers or land development applicants where cooperative efforts merit consideration. As new opportunities are selected for implementation to meet sediment reduction requirements, this PRP will be amended, advertised for public comment, and resubmitted to PA DEP.

B. Pollutant Removals

The total minimum sediment reduction required for the Township is 160,701.5 lbs/year, with 155,257.3 lbs/year, 5,425.9 lbs/year, and 18.3 lbs/year reductions required for the Catasauqua


Creek, Monocacy Creek, and East Branch Monocacy Creek HUC12 Watersheds, respectively, as shown above in Table 5. Since MapShed was used to determine pollutant loading coefficients for the land uses within the Township and to calculate the existing loads, the same data were used to calculate the load reductions resulting from the implementation of the proposed stormwater BMPs. Sediment removal efficiency values were taken from the PA DEP BMP Effectiveness Values table (3800-PM-BCW0100M) and applied to the pollutant loadings calculated for each proposed BMP to determine the reductions expected for each proposed BMP. Watersheds for proposed BMPs were developed in ArcMap using available Geographic Information Systems (GIS) data, including parcels, 2-foot Lidar topography, buildings, and land use data. For the Planning Area within the Catasauqua Creek HUC12 watershed, ten (10) identified potential BMPs would remove sediment at 770,240.3 lbs/year, which subtracted from the required sediment reduction of 155,257.3 lbs/year results in a surplus removal value of 614,982.9 lbs/year, assuming full implementation. The Township may ultimately implement any combination of the ten (10) potential BMPs to meet the 10 percent required sediment load reduction. Based on a rough analysis of cost-effectiveness for implementation, the Township is currently proposing to implement one (1) BMP within a Township park area, identified as BMP ID 023-B, that will reduce the sediment load by 557,327.3 lbs/year, or 359.0 percent within the Catasauqua Creek HUC12 Watershed. For the Planning Area within the Monocacy Creek HUC12 watershed, four (4) identified potential BMPs would remove sediment at 16,495.6 lbs/year, which subtracted from the required sediment reduction of 5,425.9 lbs/year results in a surplus removal value of 11,069.7 lbs/year, assuming full implementation. The Township may ultimately implement any combination of the four (4) potential BMPs to meet the 10 percent required sediment load reduction. Based on a rough analysis of cost-effectiveness for implementation, the Township is currently proposing to implement one (1) BMP along a Township dirt road, identified as BMP ID 007, that will reduce the sediment load by 7,296.7 lbs/year, or 134.5 percent within the Monocacy Creek HUC12 Watershed. For the Planning Area within the East Branch Monocacy Creek HUC12 watershed, four (4) identified potential BMPs at one regulated MS4 outfall location will remove sediment at 53.2 lbs/year, which subtracted from the required sediment reduction of 18.3 lbs/year results in a surplus removal value of 34.9 lbs/year, assuming full implementation. The Township may ultimately implement any combination of the four (4) potential inlet bags to meet the 10 percent required reduction. Based on a rough analysis of cost-effectiveness for implementation, the Township is currently proposing to implement one (1) BMP along a Township road, identified as BMP ID 031-D, that will reduce the sediment load by 27.1 lbs/year, or 148.1 percent within the East Branch Monocacy Creek HUC12 Watershed. As previously noted, all stormwater BMPs listed in Table 6 may be considered for implementation by the Township to meet their required sediment reduction. The Township is not committing to implement each BMP listed. BMPs will be chosen based on additional evaluation of cost-benefit once more detailed planning has been completed. The combination of selected BMPs will meet the required 10% reduction for sediment load from the Planning Area within the Township and will be implemented by the next 5-year permit term, or as formally extended. A summary of all


the currently proposed BMPs and how they meet the required 10 percent sediment load reduction is shown below in Table 6. Calculations for BMP sediment load reductions are provided in Appendix C. BMP project locations are shown in Appendix D. BMP designs will be added to this PRP as Appendix E, as they are completed, approved, and implemented.

C. Operation and Maintenance Requirements

With regard to existing and future stormwater BMPs that may be constructed on private property and not managed by the Township, the Township’s Stormwater Management Ordinance requires legally binding Operation and Maintenance (O&M) provisions which must be completed for facilities not dedicated to or accepted by the Township. The Township’s MS4 permit indicates and requires regular inspection by facility owners and Township staff at least one (1) time during each 5-year permit term. The Stormwater Management Ordinance also specifies regular inspection intervals by the owners, who are responsible for maintenance under various situations. Operation and Maintenance requirements for all stormwater management BMPs proposed for meeting the required MS4 Program pollutant reductions, including responsible parties, activities, and schedules are listed below in Table 6. The Township will be responsible for implementation of selected BMPs, as well as for regular inspections, sediment removal, and reconstruction of facilities, as needed to maintain efficiency and functionality for sediment removal.


Table 6. Summary of Proposed BMPs in the Planning Areas of East Allen Township

BMP ID BMP Type Sediment Load Reduction

(lbs/yr)

Percent of Total

Potential Reduction

Landowner Installation Responsibility

Funding Mechanism

Operation & Maintenance

Responsibility

Operation & Maintenance Activities/Schedule

Catasauqua Creek HUC12 Watershed 018 Wet Pond (alternative as Dry

Extended Detention Basin) 40,734.4 5.29% Bethlehem Authority

10 East Church Street Bethlehem, PA 18018-6005

Parcel ID: L5 14 3-3

Township Stormwater Fee/Grant Funds

Township During first year after construction, inspect vegetation every 2-3 weeks. Inspect quarterly and after major storms or rapid ice break-up to ensure proper design conditions are in place and functioning as intended, and immediately correct where deficient. Wet pond and buffer vegetation may need support (e.g. watering, weeding, mulching, replanting, etc.) during the first three years following construction. Inspect annually for invasive species and treat/remove, as needed and as applicable.

023-A Extended Detention Basin 6,193.9 0.80% East Allen TownshipParcel ID: L5 12 5A



023-B Wet Pond (alternative as Dry Extended Detention Basin)

557,327.3 72.36% East Allen Township Parcel ID: L5 12 5A

Township Stormwater Fee/ Grant Funds


024-A Wet Pond (alternative as Dry Extended Detention Basin)

131.4 0.02% David Fantasia5721 Brumar Drive

Bethlehem, PA 18017 Parcel ID: M5 4 1




1,792.2 0.23% Ruch Road Properties, LLC434 Clearfield Street

Freemansburg, PA 18017-7137 Parcel ID: M5 4 3H



026 Wet Pond (alternative as Dry Extended Detention Basin)

13,592.7 1.76% James W. and Janel C. Buskirk 6391 Hanover Street

Bethlehem, PA 18017-9213 Parcel ID: M5 3 4




46,586.9 6.05% John M., Jr. and Lucille Lightcap5709 Grouse Drive

Bethlehem, PA 18017-9218 Parcel ID: M5 4 32-24

Rose Hessinger et al 5719 Grouse Drive

Bethlehem, PA 18017 Parcel ID: M5 4 32-17

Richard and Gloria Szczepanski 6220 Hanover Street


Corinne L. Mohr 6211 Dove Drive





John J. and Lora L. Orlic 6230 Hanover Street


James R. and Hyon S. Wright 6221 Dove Drive

Bethlehem, PA 18017-9222 Parcel ID: M5 4 32-16


1,890.3 0.25% Jeremy R. and Vicki L Alleshouse5655 North Halbea Street




030-A Wet Pond (alternative as Dry Extended Detention Basin)

17,471.8 2.27% Jon Ross and Debra A. Kleckner 5828 Shows Road

Bethlehem, PA 18017 Parcel ID: L5 13 13




84,519.1 10.97% PennDOT ROW Township Stormwater Fee/ Grant Funds


Subtotals 770,240.3 100.00%

Monocacy Creek HUC12 Watershed

006 Vegetated Swale 2,598.6 15.75% East Allen Township ROW Township Stormwater Fee/Grant Funds

Township Annually, cut back perennial plants. Twice per year, check vegetation for condition, remove woody vegetation, remove accumulated sediments.

007 Vegetated Swale 7,296.7 44.23% East Allen Township ROW Township Stormwater Fee/Grant Funds


008 Vegetated Swale 4,982.5 30.20% East Allen Township ROW Township Stormwater Fee/ Grant Funds



1,617.8 9.81% Jonathan W. Pritko6179 Pond View Terrace

Bath, PA 18014-9090 Parcel ID: K5 13 22



Subtotals 16,495.6 100.00%

East Branch Monocacy Creek HUC12 Watershed

031-A Inlet Filter Bag 8.9 16.76% East Allen Township ROW Township Stormwater Fee/Grant Funds

Township Clean-out with vac truck - Minimum quarterly/as needed following runoff events.

031-B Inlet Filter Bag 6.0 11.25% East Allen Township ROW Township Stormwater Fee/ Grant Funds


031-C Inlet Filter Bag 11.2 21.03% East Allen Township ROW Township Stormwater Fee/Grant Funds


031-D Inlet Filter Bag 27.1 50.96% East Allen Township ROW Township Stormwater Fee/Grant Funds


Subtotals 53.2 100.00%

TOTALS 786,789.1 100.00%


VI. Summary East Allen Township plans to complete the planning and permitting stages of the listed projects during the next two (2) years to help ensure that the projects will be completed within the upcoming 2019-2024 permit term. The Township desires to ensure that the projects will be designed to meet the current and upcoming requirements and reduction goals, which may mean that this PRP will be revised as design and permitting are completed. Additional BMPs will be added to the plan, as necessary or as opportunities present, to improve stormwater management within the Township. Updates on each of the proposed BMPs and the implementation status of the PRP will be included in all future MS4 reporting submitted to PA DEP. The Township may consider implementing a stormwater fee to fund the installation of all proposed BMPs. Whenever practicable, the Township will apply for available funding for stormwater improvements. Fee revenues may serve as matching funds for potential grant funding where required.

Appendix A

Public Notice

Appendix B

MapShed 2011 Land Use and MS4 Planning Area

"D)"D)

"D)"D)"D)

"D)

"D)

"D)"D)"D)

"D)

"D)

"D)

"D)

"D)

"D)"D)

"D)"D)

"D)

"D)"D)

"D)

"D)

"D)

"D)

"D)"D)

"D)"D)"D)

"D)

"D)"D)

"D)

"D)

BATHText

MONOCACY

CATA

SAUQ

UACR

EEK

CREEKUNNAMED TRIBUTARY

TO CATASAUQUA CREEK

NOR-BATH BLVD

BATH PIKE

COLONY DR

OLD CARRIAGE RD

BETH

BAT

H PIK

E

WEAVERSVILLE RD

LOCUST RD

HILLSIDE RD

HANOVER ST

SNYDER CHURCH RD

W MAIN BLVD

SICKL

ERD

VALLEY VIEWRD

STONE POST RD

DRIFTWOODRD

HILLTOP RD

TANGLEWOOD RD

GREEN MEADOW RD

ARROWHEAD RD

WALN

UT ST

DOGWOOD RD

SILVER CREST RD

SHOWS RD

MEADOW RD

SNOW

DRIFT

RD

JACKSONVILLE RD

JADE LN

CHRISPHALT DR

CRICKET RD

LILAC DR

N HALBEA ST

SHADY LN

MOHAWK DR

M ONTAUK LN

L I BERTO LN

CHENANGO DR

DOUGLAS LN

ALEXANDER RD

SCHO OL RD

PRIVATE

GWENMAWR RDOSWEGO DR

ROBIN LN

BELLA LN

PHEASANT RD

SHAWNEE DR

DOVE

DR

RUCH

RD

LEHIGH LN

LOIS LN

PARKDR

POND VIEW TER

CAROL LN

ADAMS LN

GOLDCRIS LN

CIRCLE DR

BEAT

RICE

LN

BRUMARDR

STEUBEN RD

UNKNOWN

MOHAWK DR

019

025

034035

018

016017

014

031

009

011

007006008

033032

036037

010

002

001

004

028

026024

030021

020

023022

005

029

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012 013015

1:18,000

EAST ALLEN TOWNSHIPNORTHAMPTON COUNTY

PENNSYLVANIA01/18/2019

JES

MJA EA19-21

1 of 1

MS4 PROGRAM - 2019MAPSHED 2011 LAND USE AND MS4 PLANNING AREA

1 inch = 1,500 feet

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252 Broadhead Road, Suite 100Bethlehem, PA 18017

610.691.5644Fax 610.691.6968

NO. REVISIONS DATEDRAWN BY:

CHECKED BY:

DATE:

SCALE:

PROJECT NO.

SHEET NO.

SEAL

THIS DOCUMENT IS PROPERTY OF HANOVER ENGINEERING ASSOCIATES, INC. ANYUSE OF A COPY OF THIS DOCUMENT THAT DOES NOT CONTAIN AN ORIGINAL SEAL ANDSIGNATURE IS STRICTLY PROHIBITED. THIS DOCUMENT IS NOT PUBLISHED AND ALLRIGHTS ARE RESERVED BY HANOVER ENGINEERING ASSOCIATES, INC. THIS PLAN HASBEEN SEALED WITH EITHER A RED INK SEAL OR A CRIMP SEAL. IF NEITHER APPEARSON THIS PLAN, POSSIBLE REPRODUCTIONS OR ALTERATIONS MAY HAVE BEEN MADEWITHOUT THE APPROVAL OR KNOWLEDGE OF THE SIGNATORY

1.[0 1,500 3,000 4,500 6,000

Feet

Legend"D) Regulated MS4 Outfall

Municipal Boundary

Road CenterlineHydrology

Coniferous Forest

Cropland

Deciduous Forest

Disturbed

Emergent Wetland

Forested Wetland

Hay/Pasture

High-Density Mixed Urban

High-Density Residential

Low-Density Mixed Urban

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Planning Area

2011 Land UseLow-Density Residential

Medium-Density Mixed Urban

Medium-Density Residential

Mixed Forest

Open Land

Turf/Golf

Water

Urbanized Area - 2010 Census

Appendix C

Calculations for Proposed BMP Sediment Load Reductions

BMP ID Area Land Use Code Land Use Description Coeff Existing Sediment Existing Total BMP Type Sediment Load Sediment Load

(acres) (lbs/ac/yr) Load ‐ Landuse Sediment Load Reduction Coeff Reduction(lbs/yr) (lbs/yr) (percent) (lbs/yr)

CATASAUQUA CREEK

018 1.6668774 2 Low-Density Mixed Urban 38.9 64.9 67890.6 Wet Pond 0.6 40,734.4018 1.36309903 3 High-Density Mixed Urban 175.1 238.7 Wet Pond

018 23.4845099 5 Cropland 2668.5 62668.2 Wet Pond

018 0.29760862 8 Forest 15.7 4.7 Wet Pond

018 70.2340402 12 Low-Density Residential 38.9 2733.4 Wet Pond

018 10.5803867 16 Open Land 206.1 2180.7 Wet Pond

023-A 0.53199869 2 Low-Density Mixed Urban 38.9 20.7 10323.2 Extended Detention Basin 0.6 6,193.9023-A 13.3758803 4 Hay/Pasture 207.2 2772.0 Extended Detention Basin

023-A 2.63139803 5 Cropland 2668.5 7021.9 Extended Detention Basin

023-A 0.16832268 8 Forest 15.7 2.6 Extended Detention Basin

023-A 2.88903305 13 Medium-Density Residential 175.1 506.0 Extended Detention Basin

023-B 0.10423772 2 Low-Density Mixed Urban 38.9 4.1 928878.9 Wet Pond 0.6 557,327.3023-B 5.58790594 4 Hay/Pasture 207.2 1158.0 Wet Pond

023-B 346.711681 5 Cropland 2668.5 925197.4 Wet Pond

023-B 0.00841076 7 Forest 15.7 0.1 Wet Pond

023-B 8.14033293 8 Forest 15.7 127.5 Wet Pond

023-B 2.19433859 12 Low-Density Residential 38.9 85.4 Wet Pond

023-B 0.05191775 13 Medium-Density Residential 175.1 9.1 Wet Pond

023-B 13.0264986 15 Medium-Density Mixed Urban 175.1 2281.5 Wet Pond

023-B 0.07652069 16 Open Land 206.1 15.8 Wet Pond

024-A 5.58345339 12 Low-Density Residential 38.9 217.3 219.1 Wet Pond 0.6 131.4024-A 0.01006351 15 Medium-Density Mixed Urban 175.1 1.8 Wet Pond

024-B 0.06834816 5 Cropland 2668.5 182.4 2987.1 Wet Pond 0.6 1,792.2024-B 0.25039002 12 Low-Density Residential 38.9 9.7 Wet Pond



026 2.79504698 3 High-Density Mixed Urban 175.1 489.5 22654.6 Wet Pond 0.6 13,592.7026 0.9032931 4 Hay/Pasture 207.2 187.2 Wet Pond

026 5.63014346 5 Cropland 2668.5 15024.0 Wet Pond

026 39.4236325 13 Medium-Density Residential 175.1 6904.8 Wet Pond


027 0.39506174 2 Low-Density Mixed Urban 38.9 15.4 77644.9 Wet Pond 0.6 46,586.9027 26.8975532 5 Cropland 2668.5 71775.9 Wet Pond



027 0.73950343 15 Medium-Density Mixed Urban 175.1 129.5 Wet Pond


028 1.04687241 3 High-Density Mixed Urban 175.1 183.4 3150.6 Wet Pond 0.6 1,890.3028 0.20404648 5 Cropland 2668.5 544.5 Wet Pond




030-A 5.75190279 2 Low-Density Mixed Urban 38.9 223.9 29119.7 Wet Pond 0.6 17,471.8030-A 8.67937517 3 High-Density Mixed Urban 175.1 1520.1 Wet Pond

030-A 7.64904477 5 Cropland 2668.5 20411.4 Wet Pond

030-A 27.5783903 12 Low-Density Residential 38.9 1073.3 Wet Pond

030-A 6.07022897 13 Medium-Density Residential 175.1 1063.2 Wet Pond

030-A 15.9987717 15 Medium-Density Mixed Urban 175.1 2802.1 Wet Pond

030-A 9.82870818 16 Open Land 206.1 2025.8 Wet Pond

030-B 6.16651399 2 Low-Density Mixed Urban 38.9 240.0 140865.1 Wet Pond 0.6 84,519.1030-B 4.31930205 3 High-Density Mixed Urban 175.1 756.5 Wet Pond

030-B 51.589952 5 Cropland 2668.5 137667.4 Wet Pond

030-B 0.30607534 7 Forest 15.7 4.8 Wet Pond



030-B 0.30316779 16 Open Land 206.1 62.5 Wet Pond

TOTAL 810.2 1283733.8 1283733.8 770,240.3



MONOCACY CREEK

006 2.53048157 5 Cropland 1343.6 3400.0 3712.3 Vegetated Swale 0.7 2598.6006 1.77246036 8 Forest 12.7 22.5 Vegetated Swale

006 1.96171154 16 Open Land 147.8 289.8 Vegetated Swale

007 4.0585891 4 Hay/Pasture 146.3 593.9 10423.8 Vegetated Swale 0.7 7296.7007 7.17666343 5 Cropland 1343.6 9642.8 Vegetated Swale

007 0.24908713 7 Forest 12.7 3.2 Vegetated Swale



008 3.87323868 4 Hay/Pasture 146.3 566.8 7117.8 Vegetated Swale 0.7 4982.5008 4.68591272 5 Cropland 1343.6 6296.1 Vegetated Swale


008 2.81424879 12 Low-Density Residential 39.4 110.9 Vegetated Swale


010 0.84877374 3 High-Density Mixed Urban 171.7 145.7 2696.4 Wet Pond 0.6 1617.8010 1.75390238 5 Cropland 1343.6 2356.6 Wet Pond


TOTAL 45.8 23950.3 23950.3 16495.6

Existing BMP Reduction

BMP ID Area (AC) Land Use Code Land Use Coeff Existing Sediment Existing Total BMP Type Sediment Load Sediment Load

(lbs/ac/yr) Load ‐ Landuse Sediment Load Reduction Coeff Reduction(lbs/yr) (percent) (lbs/yr)

036-A 0.18426284 2 Low-Density Mixed Urban 39.4 7.3 592.0 Infiltration Basin 0.95 562.4036-A 0.00622313 3 High-Density Mixed Urban 171.7 1.1036-A 3.40001141 3 High-Density Mixed Urban 171.7 583.7

036-B 4.28779485 2 Low-Density Mixed Urban 39.4 168.9 16316.9 Wet Pond 0.6 9790.1036-B 22.0157707 3 High-Density Mixed Urban 171.7 3779.4036-B 72.0497926 3 High-Density Mixed Urban 171.7 12368.6036-B 3.53700946 12 Low-Density Residential 39.4 139.3036-B 6.26723163 15 Medium-Density Mixed Urban 171.7 1075.8036-B 2.00977172 16 Open Land 147.8 296.9

TOTAL 10352.5



EAST BRANCH MONOCACY CREEK

031‐A 0.28115 12 Low-Density Residential 39.7 11.1 11.1 Inlet Filter Bag 0.8 8.9

031‐B 0.18871 12 Low-Density Residential 39.7 7.5 7.5 Inlet Filter Bag 0.8 6.0

031‐C 0.352731 12 Low-Density Residential 39.7 14.0 14.0 Inlet Filter Bag 0.8 11.2

031‐D 0.854889 12 Low-Density Residential 39.7 33.9 33.9 Inlet Filter Bag 0.8 27.1

TOTAL 1.7 66.5 66.5 53.2

Appendix D

Proposed BMP Locations and Watersheds

"D)"D)

"D)"D)"D)

"D)

"D)

"D)"D)"D)

"D)

"D)

"D)

"D)

"D)

"D)"D)

"D)"D)

"D)

"D)"D)

"D)

"D)

"D)

"D)

"D)"D)

"D)"D)"D)

"D)

"D)"D)

"D)

"D)

BATHText

MONOCACY

CATA

SAUQ

UACR

EEK

CREEK

UNNAMED TRIBUTARYTO CATASAUQUA CREEK

LEHIGH RIVER

CATASAUQUA

CREEK

CATASAUQUACREEK

LEHIGH RIVER

CATASAUQUA

CREEK

HOKENDAUQUA

CREEK

MONOCACY

CREEK

CATASAUQUA

CREEK

EAST BRANCH

MONOCACY

CREEK

MONOCACY

CREEK

NOR-BATH BLVD

BATH PIKE

COLONY DR

OLD CARRIAGE RD

BETH

BAT

H PIK

E

WEAVERSVILLE RD

LOCUST RD

HILLSIDE RD

HANOVER ST

SNYDER CHURCH RD

W MAIN BLVD

SICKL

ERD

VALLEY VIEWRD

STONE POST RD

DRIFTWOODRD

HILLTOP RD

TANGLEWOOD RD

GREEN MEADOW RD

ARROWHEAD RD

WALN

UT ST

DOGWOOD RD

SILVER CREST RD

SHOWS RD

MEADOW RD

SNOW

DRIFT

RD

JACKSONVILLE RD

JADE LN

CHRISPHALT DR

CRICKET RD

LILAC DR

N HALBEA ST

SHADY LN

MOHAWK DR

M ONTAUK LN

L I BERTO LN

CHENANGO DR

DOUGLAS LN

ALEXANDER RD

SCHO OL RD

PRIVATE

GWENMAWR RDOSWEGO DR

ROBIN LN

BELLA LN

PHEASANT RD

SHAWNEE DR

DOVE

DR

RUCH

RD

LEHIGH LN

LOIS LN

PARKDR

POND VIEW TER

CAROL LN

ADAMS LN

GOLDCRIS LN

CIRCLE DR

BEAT

RICE

LN

BRUMARDR

STEUBEN RD

UNKNOWN

MOHAWK DR

TOWNSHIP LINE RD

019

025

034 035

018

016017

014

031

009

011

007 006008

033032

036037

010

002

001

004

028

026024

030021

020

023022

005

029

027

012 013015

036-B Wet Pond

036-A Infiltration Basin

010 Wet Pond

018 Wet Pond

023-B Wet Pond

023-A Extended Detention Basin

024-B Wet Pond

024-A Wet Pond

027 Wet Pond028 Wet Pond

026 Wet Pond

030-A Wet Pond

030-B Wet Pond

008 Vegetated Swale007 Vegetated Swale 006 Vegetated Swale

031-A, 031-B, 031-C, 031-D Inlet Filter Bag

1:18,000

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JES

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1 of 1

MS4 PROGRAM - 2019PROPOSED BMP LOCATIONS AND WATERSHEDS

1 inch = 1,500 feet

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252 Broadhead Road, Suite 100Bethlehem, PA 18017

610.691.5644Fax 610.691.6968

NO. REVISIONS DATEDRAWN BY:

CHECKED BY:

DATE:

SCALE:

PROJECT NO.

SHEET NO.

SEAL

THIS DOCUMENT IS PROPERTY OF HANOVER ENGINEERING ASSOCIATES, INC. ANYUSE OF A COPY OF THIS DOCUMENT THAT DOES NOT CONTAIN AN ORIGINAL SEAL ANDSIGNATURE IS STRICTLY PROHIBITED. THIS DOCUMENT IS NOT PUBLISHED AND ALLRIGHTS ARE RESERVED BY HANOVER ENGINEERING ASSOCIATES, INC. THIS PLAN HASBEEN SEALED WITH EITHER A RED INK SEAL OR A CRIMP SEAL. IF NEITHER APPEARSON THIS PLAN, POSSIBLE REPRODUCTIONS OR ALTERATIONS MAY HAVE BEEN MADEWITHOUT THE APPROVAL OR KNOWLEDGE OF THE SIGNATORY

1.[0 1,500 3,000 4,500 6,000

Feet

LEGEND"D) REGULATED MS4 OUTFALL

MUNICIPAL BOUNDARYSTATE ROADLOCAL ROAD

10FT LIDAR CONTOUR

HYDROLOGY (COUNTY)PARK LANDURBANIZED AREA - 2010 CENSUS

NATIONAL HYDROLOGICDATA FLOWLINE (USGS)

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HUC12 COMMUNITY BOUNDARYPROPOSED BMP WATERSHEDPROPOSED BMP

Appendix E

Project Designs (to be updated as prepared)

POLLUTANT REDUCTION PLAN (PRP)POLLUTANT REDUCTION PLAN (PRP) EAST ALLEN TOWNSHIP NORTHAMPTON COUNTY...

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